How to change stored JSON data when i clicked save button? swift 3 -


i stored user json data on "user" when login. how can change value when click save button?something : crew_preferred_name "xiao pang".

userdefaults.standard.set(json, forkey: "json") user = userdefaults().value(forkey: "json")as? nsdictionary

this json output

} crew ={ "crew_avatar" = "http://ec2-52-221-231-3.ap-southeast-1.compute.amazonaws.com/gv/images/profile_image/pang_kang_ming_916210_0e9.jpg"; "crew_contact" = 0123456789; "crew_email" = "pang@xover.com.my"; "crew_gender" = male; "crew_id" = pp000001; "crew_name" = "pang kang ming"; "crew_preferred_name" = pkm; "crew_qrcode" = "images/qrcode/qrcode_085960293a5378a64bec6ebfa3c89bb7.png";  }     message = "login sucessfully"; result = success; }

this button code, i'm posting action php don't know how change or save changes in "user" data. without code have login again see new update.

@ibaction func savebtn(_ sender: any) {     let prefername = prefernameeditlabel.text!;      if let crew = user!["crew"] as? [string:any], let crewid = crew["crew_id"] as? string, let crewemail = crew["crew_email"] as? string, let crewcontact = crew["crew_contact"] as? string {          let param = ["action": "update profile", "crew": ["crew_id": crewid, "crew_preferred_name": prefername, "crew_email": crewemail, "crew_contact": crewcontact]] [string : any]          let headers = [             "content-type": "application/json",             "cache-control": "no-cache"         ]          if let postdata = (try? jsonserialization.data(withjsonobject: param, options: [])) {              let request = nsmutableurlrequest(url: url(string: "http://52.221.231.3/gv/app_api.php")!,                                               cachepolicy: .useprotocolcachepolicy,                                               timeoutinterval: 10.0)             request.httpmethod = "post"             request.allhttpheaderfields = headers             request.httpbody = postdata              _ = urlsession.shared              if prefernameeditlabel.text != ""{                 let task = urlsession.shared.datatask(with: request urlrequest) {                     (data, response, error) -> void in                     dispatchqueue.main.async(execute: {                         if let json = (try? jsonserialization.jsonobject(with: data!, options: [.mutablecontainers])) as? nsdictionary                         {                             let result = json["result"] as? string                              if (result == "success") {                                 print(result!)                                  self.view.endediting(true)                                  let alert = uialertcontroller(title: "updated", message: "update successfully", preferredstyle: uialertcontrollerstyle.alert)                                 let okbutton = uialertaction(title: "ok", style: uialertactionstyle.cancel, handler: nil)                                 alert.addaction(okbutton)                                 self.present(alert, animated: true, completion: nil)                              }else{                                 let alert = uialertcontroller(title: "error", message: "update failed", preferredstyle: uialertcontrollerstyle.alert)                                 let okbutton = uialertaction(title: "ok", style: uialertactionstyle.cancel, handler: nil)                                 alert.addaction(okbutton)                                 self.present(alert, animated: true, completion: nil)                                 print(result!)                             }                         }                     })                 }                  task.resume()              }else{                 let alert = uialertcontroller(title: "error", message: "empty!", preferredstyle: uialertcontrollerstyle.alert)                 let okbutton = uialertaction(title: "ok", style: uialertactionstyle.cancel, handler: nil)                 alert.addaction(okbutton)                 self.present(alert, animated: true, completion: nil)             }          }      }  }

simply write line after getting latest data

userdefaults.standard.set(json, forkey: "json")

in way "json" key contain latest data , can as

user = userdefaults().value(forkey: "json")as? nsdictionary

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